Loway



(No Model.)

0. J. GALLOWAY & J. H. BEGKWITH.

WATER TUBE BOILER.

Patented Dec. 2,1890.

' UNITED STATES PATENT OEEIcE.

CHARLES J. GALLOlVAY AND JOHN ll. BECKXVITIT, OF MANCHESTER, ENGLAND.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 442,036, dated December 2, 1890. Application filed August 27,1890. Serial No. 363,194. (No model.) Patented in England May 22, 1890, No. 7,929.

To all whom it mzty concern:

Be it known that we, CHARLES JOHN GAL- LOVVAY and J OHN HENRY BEoKwITH, citizens of England, both residing at Knott Mill Iron Works, Manchester, in the county of Lancaster, England, have invented a new and usef ul Improvement in \Vater-.lube Boilers, (for which we have made application for patent in Great Britain, which patent when granted will bear date May 22, 1890, No. 7,929,) of which the following is a specification.

Our invention relates to that class of boilers in which there are two water-chambers connected by a number of tubes around which play the flames and hot products of combustion from the furnace. The water-chambers extend upward above the tubes and open into a common horizontal chamber, affording a water and steam space. Such boilers are usually set so that the tubes which connect the water-chambers are somewhat inclined, in order that the water heated and the steam generated in the tubes shall flow freely along the tubes to their upper ends, and thence up one of the end chambers into the horizontal chamber above, from which the cooler portions of the water descend the other end chamber to pass again through the tubes. There is thus produced a rapid circulation, causing such ebullition and commotion of the water in the upper chamber that the steam as it passes from the chamber is apt to carry water-spray with it.

One of the objects of our invention is to prevent this violent commotion of the water, and we effect this by dividing the upward current by a number of inclined partitions radiating from the mouth of the end chamber, so that the current is divided into a number of separate currents expanding in width and losing velocity as they ascend and flow toward the farther end of the water-space, the steam separating from them gradually and uniformly along the whole length of the chamber. The mouth of the farther water-chamher down which the circulation-current has to descend we raise some distance above the bottom of the horizontal chamber, so that there is in the lower part of the chamber a layer of undisturbed water in which deposit of impurities can take place, and we provide a blow-off cock by which these can from time to time be blown out.

For the purpose of cleanin the exterior of the water-tubes we utilize the stays of the water-chambers in the following manner: \Ve make these stays tubular, placing them, preferably, in such positions thatone of them is in the middle of the space between every three of the water-tubes. Usually the perforations of these stays are closed by plugs or covers to prevent access of air into the flamechamber; but some of them may be left open to admit air locally for promoting com bustion. When it is desired to clear the exterior of the water-tubes from soot or other matter deposited on them, we insert through the perforation of a stay or nozzle, by which we direct a jet of steam on the exterior of the tubes within reach of the jet, and we repeat this at the different stay-openings, the nozzle being connected to a flexible tube, so that the jet can be applied through any of the stays.

Figure 1 of the accompanying drawings is a longitudinal section, and Fig. 2 is an end view, of a boiler embodying our invention.

From the fireAthe flames and hot products of combustion are caused by battle-plates B to take a zigzag course between the tubes, as indicated by the arrows, to .the flue leading to the chimney. At the top of the front water-casing O,where it communicates with the steam and water chamber D,we form between inclined diverging plates E a number of expanding passages, dividing the currents of mixed steam and water that ascend from C, gradually retarding the divided streams, and allowing the steam to separate quietly therefrom. At the top of the passage by which the rear water-casing F eonnnunicates with the chamber D we provide a part G, raised above the bottom of D, so that impurities may become deposited in the quiescent water below without descending by G to F. These impurities may from time to time be cleared out by opening a blow-off cook or valve applied at H. The stays K of the water-chambers G and F are tubular and preferably so placed that there is one between every three of the tubes T, as shown in Fig. 2. Usually these tubular stays are closed by plugs or covers; or some of them, maybe left open for admission of air to promote combustion.

For the purpose of clearing soot off the tubes T, We introduce through any of the tubular stays K a nozzle L, connected by a flexible tube to a steanrpipe, so that We can direct a jet of steam along the surface of the tubes within range of the jet, thus sweeping off the matters adhering to them. Obviously, scraping or other tools might also be introduced through the tubular stays.

Having thus described the nature. of our invention and the bestmeans we know for carrying the same into practical effect, we claim A Water-tube boiler having tubular stays for its water-chambers, having a set of divided expanding passages for the current ascendin g from the higher water-chamber, and having the mouth of the passage from the lower Water-chamber raised above the bottom of the upper chamber, all substantially as and for the purposes herein set forth.

In testimony whereof we have signed our names to this specification, in the presence of two subscribing witnesses, this 11th day of August, A. D. 1890.

CHARLES J. GALLOWAY. J. H. BECKlVITI-l.

\Vitnesses:

WM. HORTON, W V r V Clerk, K'nott llf'ill, llfa'nchester. EDWARD I-I. KIRKLAND, Clerk, West Gorton, illanchcsten 

